Heart block is a disturbance of the electrical activity of the myocardium caused by damage to the cardiac conduction system. This condition slows down or completely blocks the transmission of electrical impulses between the atria and ventricles, which in turn leads to a disturbance of the heart rhythm and can significantly reduce the efficiency of blood circulation. Blockades can be partial or complete and are classified by location: at the level of the atrioventricular node (AV block) or intraventricular pathways. Depending on the degree of blockade, clinical manifestations can vary from asymptomatic to severe cardiovascular failure.
History of the disease and interesting historical facts
The first description of heart block was made in the 19th century, when the development of electrocardiography made it possible to visualize disturbed electrical impulses. In 1903, the English physiologist and inventor William E.K. Phillips demonstrated the possibility of recording cardiac activity using an electrode. This discovery became the basis for further study of the electrical activity of the heart. It is interesting that the history of the study of blockades is closely related to the study of damage to the heart muscle and its effect on the function of the conduction system. With the advent of pacemaker implantation technologies in the 20th century, the treatment of blockades became much more effective.
Epidemiology
According to statistics, the prevalence of heart block increases with age. In the age group over 65 years, the frequency of AV blocks can reach 5-10%. According to various studies, the frequency of complete AV blocks in the general population is 1-2 people per 1000, but these figures can vary significantly depending on the presence of concomitant diseases, such as coronary heart disease, arterial hypertension and diabetes.
Genetic predisposition to this disease
There are certain genetic aspects that may contribute to the development of heart block. In some cases, inherited diseases such as Brugada syndrome and LVH (left ventricular hypertrophy) may be associated with defects in the genes responsible for ion channels, which leads to disruption of the electrical activity of the heart. For example, mutations in the SCN5A and KCNQ1 genes have already been linked to an increased susceptibility to arrhythmias.
Risk factors for the development of this disease
There are many risk factors that contribute to the development of heart block:
- Systemic: arterial hypertension, coronary heart disease and heart failure.
- Bad habits: smoking and drinking alcohol.
- Environmental factors: exposure to toxins and some infectious diseases.
- Drug factors: Use of certain medications, such as beta blockers and antiarrhythmic drugs, can cause heart block.
- Associated conditions: Thyroid disease and diabetes increase the likelihood of developing a blockage.
Diagnosis of this disease
Diagnosis of heart block begins with a clinical examination and analysis of symptoms. The main symptoms include:
- Dizziness and fainting.
- Fatigue and shortness of breath.
- Chest pain.
Laboratory tests may include a complete blood count, electrolytes, and biomarker levels such as troponin. Radiologic tests, such as echocardiography, help rule out organic heart disease. An electrocardiogram (ECG) is used to confirm the diagnosis and evaluate the nature of the block. The differential diagnosis should include other possible causes of abnormal heart rhythms, such as sick sinus syndrome.
Treatment
General treatment of heart block involves correcting underlying conditions such as hypertension and coronary artery disease. Pharmacological treatment may include antiarrhythmic drugs, beta blockers, and anticoagulants. In cases of complete heart block with symptoms requiring intervention, surgical treatment is indicated, such as implantation of a pacemaker. Other treatment options may include magnetic therapy and physical therapy.
List of medications used to treat this disease
- Amiodarone.
- Sotalol.
- Beta blockers (eg, metoprolol).
- Anticoagulants (eg, warfarin).
Disease monitoring
Monitoring of a patient with heart block includes regular examinations by a cardiologist, monitoring of cardiovascular parameters, and an ECG to assess the dynamics of the block. The prognosis for heart block depends on its type and associated diseases. Possible complications include the development of severe cardiovascular conditions such as congestive heart failure and thrombosis.
Age-related features of the disease
Heart block may present differently depending on the age group. Older people often experience more pronounced symptoms, such as shortness of breath and general weakness, while younger patients may experience no symptoms. In children, the block is most often temporary and may be associated with physiological changes in the body.
Questions and Answers
- What are the main symptoms of heart block? The main symptoms include dizziness, fainting, shortness of breath and chest pain.
- How is heart block diagnosed? Diagnostics includes ECG, as well as laboratory and radiological studies.
- What is the treatment for heart block? Treatment may include medication, surgery, or the implantation of a pacemaker.
- What are the risk factors for heart block? Risk factors include hypertension, coronary heart disease and bad habits.
- What is the prognosis and possible complications of heart block? The prognosis depends on the type of block and associated diseases; complications such as heart failure are possible.
Advice from Dr. Oleg Korzhikov
In practice, questions often arise about how to prevent heart block. First of all, it is necessary to monitor the condition of the cardiovascular system, regularly undergo medical examinations and control blood pressure. It is important to lead an active lifestyle, avoid stress and eat right. Excess weight and sedentary lifestyle are risk factors, so it is recommended to engage in physical activity on a regular basis. And of course, follow the instructions of your doctor and do not forget about the need to take the prescribed medications.
